25251261 has 16 divisors (see below), whose sum is σ = 38580864. Its totient is φ = 14390784.

The previous prime is 25251227. The next prime is 25251287. The reversal of 25251261 is 16215252.

It is a happy number.

It is not a de Polignac number, because 25251261 - 2¹⁰ = 25250237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25251661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7705 + ... + 10481.

It is an arithmetic number, because the mean of its divisors is an integer number (2411304).

Almost surely, 2^25251261 is an apocalyptic number.

25251261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25251261 is a deficient number, since it is larger than the sum of its proper divisors (13329603).

25251261 is a wasteful number, since it uses less digits than its factorization.

25251261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220.

The product of its digits is 1200, while the sum is 24.

The square root of 25251261 is about 5025.0632831836. The cubic root of 25251261 is about 293.3780990851.

The spelling of 25251261 in words is "twenty-five million, two hundred fifty-one thousand, two hundred sixty-one".